EP0256925B1 - Method of manufacturing an hydropneumatic accumulator and accumulator obtained by such a method - Google Patents

Method of manufacturing an hydropneumatic accumulator and accumulator obtained by such a method Download PDF

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Publication number
EP0256925B1
EP0256925B1 EP87401784A EP87401784A EP0256925B1 EP 0256925 B1 EP0256925 B1 EP 0256925B1 EP 87401784 A EP87401784 A EP 87401784A EP 87401784 A EP87401784 A EP 87401784A EP 0256925 B1 EP0256925 B1 EP 0256925B1
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EP
European Patent Office
Prior art keywords
cup
casing
membrane
hydro
pneumatic accumulator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87401784A
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German (de)
French (fr)
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EP0256925A1 (en
Inventor
André Stil
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Automobiles Peugeot SA
Automobiles Citroen SA
Original Assignee
Automobiles Peugeot SA
Automobiles Citroen SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0256925A1 publication Critical patent/EP0256925A1/en
Application granted granted Critical
Publication of EP0256925B1 publication Critical patent/EP0256925B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/12—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means attached at their periphery
    • F15B1/14—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means attached at their periphery by means of a rigid annular supporting member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3151—Accumulator separating means having flexible separating means the flexible separating means being diaphragms or membranes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3156—Accumulator separating means having flexible separating means characterised by their attachment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F15B2201/411—Liquid ports having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/415—Gas ports
    • F15B2201/4155—Gas ports having valve means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49394—Accumulator making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/4984—Retaining clearance for motion between assembled parts
    • Y10T29/49844—Through resilient media

Definitions

  • the present invention relates to hydro-pneumatic accumulators comprising a sheet metal casing and an elastomeric casing which separates the interior of the casing into a first chamber containing a pressurized gas and a second chamber containing a liquid, this membrane being fixed to the envelope by a cup.
  • accumulators are manufactured by cold deforming a sheet metal disc in two operations making it possible to obtain a cylindrical or conical blank, one end of which has a convex bottom and is provided with a gas filling orifice in the first chamber, and a second operation in which, after fixing the membrane in the envelope using the cup, the cylindrical part of the blank is restrained to give it a spherical shape having an axial orifice in which a fitting is crimped and welded liquid in the second chamber.
  • the object of the present invention is an improvement to the manufacture of these accumulators with the aim of simplifying assembly and reducing the risk of leaks.
  • the method according to the invention is characterized in that the first deformation operation is carried out so that the convex bottom of the blank has internal bosses, which is then welded the cup onto these bosses and which is engaged then the edge of the membrane between the blank and the cup, the tightening of the membrane between the cup and the envelope being obtained during the second spherical retaining operation.
  • the present invention also relates to a hydro-pneumatic accumulator obtained by the process defined above and in which the cup is fixed to the bottom of the envelope by welding on internal bosses of the bottom of the envelope.
  • the cup may have a conical edge which cooperates with a conical edge of the membrane during assembly of the latter.
  • a valve made of elastomeric material can be inserted between the bottom of the envelope and the cup, in line with the gas filling orifice, the cup having an opening allowing the gas contained in the chamber to apply this valve against the orifice.
  • a sheet metal disc is deformed so as to obtain a cylindrical or conical blank 1, one end of which has a convex bottom 2; the central part of this bottom is flat and has a central filling orifice 3 as well as three internal bosses 4 at 120 ° from each other.
  • the blank 1 has at least two diametrically opposite external impressions 5.
  • a fixing cup 6 is then welded to the bosses 4 by interposing a rubber valve 7 between this cup and the domed bottom 2, in line with the central orifice 3.
  • This cup has a certain number of holes at mid-height 8 regularly distributed, for example eight in number, two of them being interposed opposite the cavities 5 and a central hole 8 1 .
  • the cup 6 has a conical edge 10 above which is an annular groove 11.
  • the end edge 12 of the membrane 9 is conical and this membrane comprises after this edge successively a bead 13, an annular groove 14 and a bead 15.
  • the edge of the membrane 9 is engaged between the blank 1 and the cup 6, which is facilitated by the conical edges 10 of the cup and 12 of the membrane, until the bead 13 of the membrane is engaged in the groove 11 of the cup, the edge 10 of the latter being applied between the groove 14 and the bead 15 of the membrane.
  • the end of the blank 1 is narrowed so as to give it a spherical shape which delimits an axial orifice of small diameter; a fitting 16 is crimped in this orifice and it is welded as indicated in 17.
  • the membrane 9 is clamped between the cup 6 and the envelope formed by the shrunk blank 1, as seen in Figure 1 in which there is shown on the right, in phantom, the shape of the blank 1 before shrinking and in solid lines that of the envelope after shrinking of the blank.
  • the arrangement of the imprints 5 and the holes 8 means that in the event of bursting, this occurs without ejection.

Description

La présente invention concerne les accumulateurs hydro-pneumatiques comportant une enveloppe en tôle et une enveloppe en élastomère qui sépare l'intérieur de l'enveloppe en une première chambre contenant un gaz sous pression et une deuxième chambre contenant un liquide, cette membrane étant fixée à l'enveloppe par une coupelle.The present invention relates to hydro-pneumatic accumulators comprising a sheet metal casing and an elastomeric casing which separates the interior of the casing into a first chamber containing a pressurized gas and a second chamber containing a liquid, this membrane being fixed to the envelope by a cup.

On fabrique ces accumulateurs en déformant à froid un disque de tôle en deux opérations permettant d'obtenir une ébauche cylindrique ou conique dont une extrémité présente un fond bombé et est munie d'un orifice de remplissage en gaz de la première chambre, et une seconde opération dans laquelle, après fixation de la membrane dans l'enveloppe à l'aide de la coupelle, on rétraint la partie cylindrique de l'ébauche pour lui donner une forme sphérique présentant un orifice axial dans lequel on sertit et soude un raccord d'amenée de liquide dans la deuxième chambre.These accumulators are manufactured by cold deforming a sheet metal disc in two operations making it possible to obtain a cylindrical or conical blank, one end of which has a convex bottom and is provided with a gas filling orifice in the first chamber, and a second operation in which, after fixing the membrane in the envelope using the cup, the cylindrical part of the blank is restrained to give it a spherical shape having an axial orifice in which a fitting is crimped and welded liquid in the second chamber.

Jusqu'à présent la coupelle était fixée à l'enveloppe par une vis et un écrou permettant, après gonflage de l'accumulateur, de serrer la tête de la vis contre un joint d'étanchéité. Un accumulateur de ce genre est décrit dans le document FR-A 1 474 842.Until now the cup was fixed to the envelope by a screw and a nut allowing, after inflation of the accumulator, to tighten the head of the screw against a seal. An accumulator of this kind is described in document FR-A 1 474 842.

La présente invention a pour objet un perfectionnement apporté à la fabrication de ces accumulateurs dans le but de simplifier le montage et de diminuer le risque de fuites.The object of the present invention is an improvement to the manufacture of these accumulators with the aim of simplifying assembly and reducing the risk of leaks.

Le procédé selon l'invention est caractérisé en ce qu'on procède à la première opération de déformation de manière que le fond bombé de l'ébauche présente des bossages internes, qu'on soude ensuite la coupelle sur ces bossages et qu'on engage ensuite le bord de la membrane entre l'ébauche et la coupelle, le serrage de la membrane entre la coupelle et l'enveloppe étant obtenu lors de la deuxième opération de rétraint sphérique.The method according to the invention is characterized in that the first deformation operation is carried out so that the convex bottom of the blank has internal bosses, which is then welded the cup onto these bosses and which is engaged then the edge of the membrane between the blank and the cup, the tightening of the membrane between the cup and the envelope being obtained during the second spherical retaining operation.

La présente invention a également pour objet un accumulateur hydro-pneumatique obtenu par le procédé défini ci-dessus et dans lequel la coupelle est fixée au fond de l'enveloppe par soudure sur des bossages internes du fond de l'enveloppe.The present invention also relates to a hydro-pneumatic accumulator obtained by the process defined above and in which the cup is fixed to the bottom of the envelope by welding on internal bosses of the bottom of the envelope.

La coupelle peut présenter un bord conique qui coopère avec un bord conique de la membrane lors du montage de cette dernière.The cup may have a conical edge which cooperates with a conical edge of the membrane during assembly of the latter.

Un clapet en matière élastomère peut être inséré entre le fond de l'enveloppe et la coupelle, au droit de l'orifice de remplissage en gaz, la coupelle présentant une ouverture permettant au gaz contenu dans la chambre d'appliquer ce clapet contre l'orifice.A valve made of elastomeric material can be inserted between the bottom of the envelope and the cup, in line with the gas filling orifice, the cup having an opening allowing the gas contained in the chamber to apply this valve against the orifice.

On a décrit c-après un mode de réalisation d'un accumulateur hydro-pneumatique selon l'invention, avec référence à la Figure Unique du dessin annexé qui est une vue en coupe axiale de cet accumulateur.An embodiment of a hydro-pneumatic accumulator according to the invention has been described below, with reference to the Single Figure of the appended drawing which is an axial section view of this accumulator.

Pour fabriquer un accumulateur hydropneumatique selon l'invention, on déforme un disque de tôle de manière à obtenir une ébauche cylindrique ou conique 1 dont une extrémité présente un fond bombé 2; la partie centrale de ce fond est plane et présente un orifice central de remplissage 3 ainsi que trois bossages internes 4 à 120° les uns des autres. Au raccordement de la partie centrale et de la partie bombée, l'ébauche 1 présente au moins deux empreintes extérieures diamétralement opposées 5.To manufacture a hydropneumatic accumulator according to the invention, a sheet metal disc is deformed so as to obtain a cylindrical or conical blank 1, one end of which has a convex bottom 2; the central part of this bottom is flat and has a central filling orifice 3 as well as three internal bosses 4 at 120 ° from each other. When the central part and the curved part are connected, the blank 1 has at least two diametrically opposite external impressions 5.

On soude ensuite sur les bossages 4 une coupelle de fixation 6 en interposant un clapet en caoutchouc 7 entre cette coupelle et le fond bombé 2, au droit de l'orifice central 3. Cette coupelle présente à mi-hauteur un certain nombre de trous 8 régulièrement répartis, par exemple au nombre de huit, deux d'entre eux étant interposés en face des empreintes 5 et un trou central 81.A fixing cup 6 is then welded to the bosses 4 by interposing a rubber valve 7 between this cup and the domed bottom 2, in line with the central orifice 3. This cup has a certain number of holes at mid-height 8 regularly distributed, for example eight in number, two of them being interposed opposite the cavities 5 and a central hole 8 1 .

On encliquète ensuite sur la coupelle 6 le bord périphérique d'une membrane 9 destinée à séparer dans l'accumulateur la chambre de gaz de la chambre de liquide. A cet effet, la coupelle 6 présente un bord conique 10 au-dessus duquel se trouve une gorge annulaire 11. Le bord d'extrémité 12 de la membrane 9 est conique et cette membrane comporte après ce bord successivement un bourrelet 13, une gorge annulaire 14 et un bourrelet 15. On engage le bord de la membrane 9 entre l'ébauche 1 et la coupelle 6, ce qui est facilité par les bords coniques 10 de la coupelle et 12 de la membrane, jusqu'à ce que le bourrelet 13 de la membrane soit engagé dans la gorge 11 de la coupelle, le bord 10 de cette dernière étant appliqué entre la gorge 14 et le bourrelet 15 de la membrane.The peripheral edge of a membrane 9 intended to separate the gas chamber from the liquid chamber is then snapped onto the cup 6. For this purpose, the cup 6 has a conical edge 10 above which is an annular groove 11. The end edge 12 of the membrane 9 is conical and this membrane comprises after this edge successively a bead 13, an annular groove 14 and a bead 15. The edge of the membrane 9 is engaged between the blank 1 and the cup 6, which is facilitated by the conical edges 10 of the cup and 12 of the membrane, until the bead 13 of the membrane is engaged in the groove 11 of the cup, the edge 10 of the latter being applied between the groove 14 and the bead 15 of the membrane.

Enfin on rétreint l'extrémité de l'ébauche 1 de manière à lui donner une forme sphérique l'qui délimite un orifice axial de faible diamètre; on sertit dans cet orifice un raccord 16 et on le soude comme indiqué en 17. Lors de cette opération de rétreint, la membrane 9 est serrée entre la coupelle 6 et l'enveloppe constituée par l'ébauche 1 rétreinte, comme on le voit à la Figure 1 dans laquelle on a représenté à droite, en traits mixtes, la forme de l'ébauche 1 avant rétreint et en traits pleins celle de l'enveloppe après rétreint de l'ébauche.Finally, the end of the blank 1 is narrowed so as to give it a spherical shape which delimits an axial orifice of small diameter; a fitting 16 is crimped in this orifice and it is welded as indicated in 17. During this shrinking operation, the membrane 9 is clamped between the cup 6 and the envelope formed by the shrunk blank 1, as seen in Figure 1 in which there is shown on the right, in phantom, the shape of the blank 1 before shrinking and in solid lines that of the envelope after shrinking of the blank.

Il ne reste plus qu'à gonfler l'accumulateur en y introduisant un gaz sous pression, par exemple de l'azote, par l'orifice de remplissage 3. Sous l'effet de la pression de ce gaz, la membrane 9 qui avait la forme représentée en traits mixtes, se déforme et prend une forme sphérique, comme indiqué en traits pleins, en venant s'appliquer sur la paroi de l'enveloppe, la partie centrale de cette membrane venant s'appliquer sur le raccord 16. Lorsque la pression souhaitée dans l'accumulateur est atteinte, à la coupure du gaz sous pression de remplissage, le clapet 7 s'applique sur t'orifice 3 empêchant la sortie du gaz introduit. Il ne reste plus qu'à souder à l'intérieur de l'orifice 3 un bouchon 18 qui assure l'étanchéité finale et renforce la calotte sphérique.It only remains to inflate the accumulator by introducing a pressurized gas, for example nitrogen, through the filling orifice 3. Under the effect of the pressure of this gas, the membrane 9 which had the shape shown in dashed lines deforms and takes on a spherical shape, as indicated in solid lines, by being applied to the wall of the envelope, the central part of this membrane being applied to the connector 16. When the desired pressure in the accumulator is reached, when the gas is cut off under filling pressure, the valve 7 is applied to the orifice 3 preventing the exit of the gas introduced. It only remains to weld inside the orifice 3 a plug 18 which provides the final seal and strengthens the spherical cap.

La disposition des empreintes 5 et des trous 8 fait qu'en cas d'éclatement, celui-ci se produit sans éjection.The arrangement of the imprints 5 and the holes 8 means that in the event of bursting, this occurs without ejection.

Claims (7)

1. Method of manufacturing a hydro-pneumatic accumulator comprising a metal sheet casing (1 a-2) and an elastomer membrane (9) which separates the inside of the casing into a first chamber containing a pressurized gas and a second chamber containing a liquid, this membrane being fixed to the casing by a cup (6), in which method a metal sheet disc is deformed in two operations, namely a first operation for obtaining a cylindrical or conical blank (1) one end of which has a rounded bottom (2) and an orifice (3) for filling the first chamber with gas, and a second operation in which, after the membrane (9) has been fixed in the casing by means of the cup (6), the cylindrical portion (1) of the blank is hammered so as to give it spherical shape with an axial orifice in which a connection (16) is crimped and welded for feeding liquid into the second chamber, characterized in that the first deformation operation is carried out so that the rounded bottom (2) of the blank (1) has intemal bosses (4), then the cup (6) is welded to these bosses (4) and the edge (12) of the membrane (9) is then engaged between the blank (1) and the cup (6), clamping of the membrane between the cup and the casing being obtained during the second spherical hammering operation.
2. Hydro-pneumatic accumulator, characterized in that it is obtained by the method defined in claim 1, the cup (6) being fixed to the bottom (2) of the casing by welding to internal bosses (4) at the bottom of the casing.
3. Hydro-pneumatic accumulator according to claim 1, characterized in that the cup (6) has a tapered edge (10) cooperating, during fitting, with the tapered edge (12) of the membrane (9).
4. Hydro-pneumatic accumulator according to claim 2 or 3, characterized in that an elastomer material valve (7) is inserted between the bottom of the casing and the cup in line with the gas filling orifice (3), the cup (8) having an opening (8a) so that the gas contained in the chamber applies this valve against the orifice.
5. Hydro-pneumatic accumulator according to one of claims 2 to 4, characterized in that a plug (18) is welded to the casing for closing the filling orifice (3).
6. Hydro-pneumatic accumulator according to one of claims 2 to 5, characterized in that its casing has at least two diametrically opposite imprints (5) on its external surface.
7. Hydro-pneumatic accumulator according to claim 6, characterized in that the cup (6) has at least two holes (8) disposed preferably in front of the imprints (5).
EP87401784A 1986-08-04 1987-07-30 Method of manufacturing an hydropneumatic accumulator and accumulator obtained by such a method Expired - Lifetime EP0256925B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8611482A FR2602283B1 (en) 1986-08-04 1986-08-04 METHOD FOR MANUFACTURING A HYDROPNEUMATIC ACCUMULATOR
FR8611482 1986-08-04

Publications (2)

Publication Number Publication Date
EP0256925A1 EP0256925A1 (en) 1988-02-24
EP0256925B1 true EP0256925B1 (en) 1990-04-18

Family

ID=9338141

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Application Number Title Priority Date Filing Date
EP87401784A Expired - Lifetime EP0256925B1 (en) 1986-08-04 1987-07-30 Method of manufacturing an hydropneumatic accumulator and accumulator obtained by such a method

Country Status (6)

Country Link
US (2) US4800642A (en)
EP (1) EP0256925B1 (en)
JP (1) JPS63125801A (en)
DE (1) DE3762369D1 (en)
ES (1) ES2014028B3 (en)
FR (1) FR2602283B1 (en)

Families Citing this family (8)

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Publication number Priority date Publication date Assignee Title
US5074625A (en) * 1990-03-12 1991-12-24 Jones Ed F Adjustable pressure variable response fluid brake system regulators
US5655569A (en) * 1995-02-21 1997-08-12 Kelsey-Hayes Company Gas charged bladder for low pressure accumulator for vehicular anti-lock braking system
US5638868A (en) * 1996-06-05 1997-06-17 Valcor Engineering Accumulator
US5709248A (en) * 1996-09-30 1998-01-20 Caterpillar Inc. Internal accumulator for hydraulic systems
US5682923A (en) * 1996-09-30 1997-11-04 Caterpillar Inc. Accumulator having an internal elastomeric member
CN1092294C (en) * 1997-09-29 2002-10-09 曹建钢 Membrane accumulator
US7497202B2 (en) * 2004-10-15 2009-03-03 Robert Bosch Gmbh Hydraulic damper element
CN109049491B (en) * 2018-08-29 2020-09-18 航天材料及工艺研究所 Capsule assembly for spherical pressure accumulator of servo mechanism and forming die and forming method thereof

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Publication number Priority date Publication date Assignee Title
US2880759A (en) * 1956-06-06 1959-04-07 Bendix Aviat Corp Hydro-pneumatic energy storage device
FR1211462A (en) * 1958-07-22 1960-03-16 Improvements to pressurized fluid separators
FR75397E (en) * 1959-03-26 1961-06-09 Improvements to pressurized fluid separators
FR79885E (en) * 1961-05-31 1963-02-08 Improvements to pressurized fluid separators
GB930900A (en) * 1962-01-12 1963-07-10 Greer Hydraulics Inc Pressure vessel
US3397719A (en) * 1965-08-30 1968-08-20 Langen & Co Hydraulic pressure accumulator
FR1474842A (en) * 1966-01-13 1967-03-31 Citroen Sa Andre Manufacturing process for pressurized fluid tanks
BE691815A (en) * 1966-01-13 1967-05-29
FR1493719A (en) * 1966-07-21 1967-09-01 Citroen Sa Andre Hydraulic diaphragm accumulator
US4427028A (en) * 1979-11-13 1984-01-24 Vsi Corporation Resistance welded accumulator device
US4506431A (en) * 1982-07-26 1985-03-26 The Normand Trust Method of making pressure resistant accumulator device

Also Published As

Publication number Publication date
ES2014028B3 (en) 1990-06-16
FR2602283A1 (en) 1988-02-05
US4800642A (en) 1989-01-31
FR2602283B1 (en) 1988-10-21
US4852615A (en) 1989-08-01
DE3762369D1 (en) 1990-05-23
EP0256925A1 (en) 1988-02-24
JPS63125801A (en) 1988-05-30

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